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Notoconchidium

Rhynchonellata - Rhynchonellida - Hebetoechiidae

Taxonomy
Notoconchidium was named by Gill (1951) [Sepkoski's age data: S u D l Sepkoski's reference number: 538].

It was assigned to Pentameridae by Gill (1951); to Rhynchonellida by Sepkoski (2002); and to Sphaerirhynchiinae by Williams et al. (2002).

Synonymy list
YearName and author
1951Notoconchidium Gill pp. 187 - 188
2002Notoconchidium Sepkoski, Jr.
2002Notoconchidium Williams et al. p. 1108

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderRhynchonellidaKuhn 1949
superfamilyUncinuloideaRzonsnitskaya 1956
familyHebetoechiidaeHavlicek 1960
subfamilySphaerirhynchiinaeSavage 1996
genusNotoconchidium

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
E. D. Gill 1951Multicostellate, rectimarginate, pentamerid brachiopods, in which both valves are of more or less equal convexity; there is an angular deflection of the lateral margins of the dorsal valve, and often also of those of the ventral valve. The septal plates of the dorsal valve diverge slightly, then converge, and laterally to them thick callists develop with age. In the ventral valve a small spondylium is present and a median septum one quarter to one half of the valve in length. In adult shells, small tooth-like processes develop on the spondylial plates.